I have this problem too. The only thing that really worked well for me was acupuncture. I woke up one day and could barely open my mouth. It was awful. Ear pain, jaw, the head, neck, etc. anyway, after one treatment I slept with my mouth open, no clenching. I did four treatments all together and it was great. If you can afford it, I would give it a try. It really helped. Other than that, like Sara said, soft foods, and warm compresses. Good luck.